Here is my take on the problem in Photoshop. Paint a shape : Fill : select with magic wand . Then go select /Modify/ Smooth . Settings depend on size of shape. I did my large then sized image down to a more appropriate size. Got to paths. Make work path from selection. This further smooths the path. Stroke path with brush. (setting brush up before hand.) I used the grass brush as it was the closest to what everyone else is using. Not perfect but is does decrease the problem.